Athletes and Sickness: Why You Get Sick and How to Stay Training

When people think of athletes, they think of strength, discipline, and resilience. The assumption is simple. If you train hard, eat well, and stay consistent, you should be less likely to get sick.

But the reality is more complex.

In many cases, athletes are actually at a higher risk of getting sick, especially during intense training periods or high stress phases. This is where the conversation around athletes and sickness becomes important. Performance and health are closely connected, and pushing one too far without supporting the other can lead to problems.

Every training session places stress on the body. That stress is what drives adaptation, but it also temporarily suppresses the immune system. When that stress is paired with poor sleep, travel, high life demands, or inadequate nutrition, the body starts to fall behind in recovery. Over time, this creates a window where illness becomes more likely.

For tactical athletes, this risk is even higher. Long hours, unpredictable schedules, operational stress, and limited recovery can stack on top of physical training. The result is a system that is constantly under load, with very little time to fully reset.

Getting sick is not just an inconvenience. It interrupts training, reduces performance, and can set progress back weeks if not managed correctly. More importantly, it is often a signal that the body has been pushed beyond what it can currently recover from.

The goal of this article is not just to explain why athletes get sick, but to help you understand how to manage training, stress, and recovery in a way that keeps you performing at a high level.

Why Athletes Get Sick

To understand the relationship between athletes and sickness, you have to understand one key concept: stress is cumulative.

Training is stress. Work is stress. Travel is stress. Poor sleep is stress. Even under fueling is a form of stress. When these stack together without enough recovery, the immune system starts to take a hit.

This is why athletes often get sick not when they are doing nothing, but when they are doing the most.

High training loads are one of the biggest contributors. Intense workouts, long sessions, and high volume weeks all place significant demand on the body. After hard training, the immune system enters a temporary suppressed state. This is sometimes referred to as an “open window,” where the body is more vulnerable to viruses and infections.

Now layer in poor sleep. Sleep is where the body restores immune function, regulates hormones, and repairs tissue. When sleep drops below seven hours consistently, the body cannot keep up. For athletes and sickness, this is one of the fastest ways to run into problems.

Travel and competition add another layer. Changes in time zones, disrupted routines, exposure to new environments, and close contact with others all increase the likelihood of getting sick. Tactical athletes face a similar issue during deployments or high tempo operational periods, where recovery is limited and exposure risk is high.

Nutrition is another major factor. When athletes do not eat enough to match their training demands, the body lacks the resources it needs to recover. Low energy availability weakens immune function, making it easier for illness to take hold. Even a small deficit over time can have a compounding effect.

Finally, there is psychological stress. High pressure environments, demanding schedules, and constant performance expectations increase cortisol levels. Elevated cortisol over long periods suppresses immune response and makes it harder for the body to fight off illness.

When all of these factors combine, high training load, poor sleep, travel, under-fueling, and stress, the body starts to lose its ability to defend itself.

This is the core issue with athletes and sickness. It is not one thing that causes illness. It is the accumulation of stress without enough recovery to balance it.

And the more serious the athlete, the more important it becomes to manage that balance.

Highest Risk Times for Athletes

When it comes to athletes and sickness, timing matters just as much as total stress. Illness does not usually appear randomly. It tends to show up during predictable high risk periods when stress is elevated and recovery is limited.

One of the most common high risk windows is during high volume or high intensity training blocks. These are periods where athletes are pushing their limits to drive adaptation. Training frequency increases, sessions become more demanding, and recovery time often decreases. While this is necessary for progress, it also places the immune system under sustained pressure. If recovery is not matched to the workload, illness becomes much more likely.

For tactical athletes, this can look like selection prep, deployment preparation, or extended field training. These phases combine physical stress with mental and operational demands, creating an environment where the body is constantly taxed.

Another major risk period is during competition or deployment. Leading into an event, athletes often taper physically but experience a spike in psychological stress. Travel, disrupted routines, poor sleep, and increased exposure to other people all raise the risk of getting sick. It is common for athletes to feel symptoms either right before or immediately after a major event because of this stress shift.

Work stress and operational stress also play a significant role. Even if training is well structured, external stress can tip the balance. Long work hours, high responsibility, lack of control over schedule, and mental fatigue all contribute to overall load. When combined with training, this creates a situation where the body is constantly in a stressed state without enough time to recover.

Another overlooked risk window is the period right after a hard block or major event. Once the pressure drops, the immune system can rebound, and symptoms that were held off during the high stress phase can appear. This is why many athletes get sick immediately after competitions, deployments, or intense training cycles.

Understanding these high risk periods is critical when managing athletes and sickness. The goal is not to avoid hard training or important events. The goal is to recognize when the body is under the most strain and adjust recovery, nutrition, and expectations accordingly.

First Signs of Oncoming Sickness

When it comes to athletes and sickness, the difference between a minor setback and a full blown illness often comes down to awareness. The body almost always gives early warning signs before things get worse. The problem is that many athletes ignore them.

These early signs are often subtle, but they are consistent.

One of the first indicators is a drop in energy that feels different from normal fatigue. Training fatigue is expected, but this feels deeper. Workouts feel harder than they should. Warm ups feel sluggish. Motivation drops even when you are mentally trying to push through.

Another common sign is a sore or scratchy throat, especially in the morning or later in the day. This is often one of the earliest signals that the immune system is under stress.

You may also notice an elevated resting heart rate. If your heart rate is higher than normal upon waking, it can be a sign that your body is fighting something or is under more stress than it can currently handle.

Sleep disturbances are another red flag. Trouble falling asleep, waking up frequently, or not feeling rested after a full night of sleep all point to the body struggling to recover.

Performance is also a key indicator. A sudden and unexplained drop in performance is often one of the clearest signs that something is off. Weights feel heavier, endurance drops, and coordination may feel slightly off.

Loss of appetite or changes in hunger can also appear. Athletes who normally fuel well may suddenly feel less hungry or uninterested in food, which further compounds the problem.

The key with athletes and sickness is not just recognizing these signs, but responding to them early. Ignoring them and continuing to train at full intensity often turns a small issue into a full illness.

Catching these signals early gives you a chance to adjust training, increase recovery, and prevent a complete breakdown.

When You Should and Should Not Train

One of the most important decisions in managing athletes and sickness is knowing when to push and when to pull back. Training at the wrong time can turn a minor issue into a full illness, while adjusting early can keep you on track with minimal disruption.

A simple guideline often used is the “above the neck vs below the neck” rule.

If symptoms are above the neck, such as a mild sore throat, slight congestion, or a runny nose, light training can still be appropriate. In these cases, reduce intensity and volume. Focus on movement, not performance. This could mean an easy session, lower weights, or short aerobic work. The goal is to maintain rhythm without adding excessive stress.

However, if symptoms are below the neck, training should stop. This includes chest congestion, deep coughing, fever, body aches, or extreme fatigue. These are signs that the body is actively fighting something more serious. Continuing to train in this state places additional stress on the system and can prolong recovery or worsen the illness.

There is also a middle ground that many athletes overlook. Even if symptoms are mild, but performance feels significantly off, energy is low, or resting heart rate is elevated, it is often better to reduce training load. This is where smart athletes separate themselves. They adjust early instead of waiting until they are forced to stop.

For tactical athletes, this decision becomes even more important. Operational demands do not always allow for perfect recovery. This makes it critical to manage training stress intelligently outside of those periods. Pushing through illness during already high stress phases can have a compounding effect.

One of the biggest mistakes in athletes and sickness is trying to maintain normal training intensity when the body is clearly under strain. Short term discipline can turn into long term setback.

The goal is not to avoid training. The goal is to train appropriately for your current state.

Some days that means pushing hard.

Some days that means backing off.

And some days that means resting completely.

Knowing the difference is what keeps you consistent over time.

How to Prevent Illness

Preventing illness is where athletes gain a real advantage. When it comes to athletes and sickness, the goal is to reduce how often illness happens by managing stress, recovery, and exposure with precision.

Start with hygiene. Wash your hands for at least 20 seconds after training, before eating, and after being in public spaces. Avoid touching your face during workouts. If you are in a shared gym environment, wipe down equipment before and after use. During high risk periods, limit close contact with people who are visibly sick.

Training load should increase gradually. A good rule is to avoid increasing total weekly volume or intensity by more than 5 to 10 percent per week. Sudden spikes in workload are strongly linked to immune suppression. Every 4 to 6 weeks, include a deload or reduced intensity week to allow full recovery.

Sleep is one of the most powerful tools for preventing athletes and sickness. Aim for 7 to 9 hours per night, with athletes in heavy training closer to 8 to 9 hours. Keep sleep consistent by going to bed and waking up within the same 60 minute window daily. If sleep drops below 6 hours for multiple nights, illness risk increases significantly.

Nutrition must match training demand. A general guideline is to ensure you are not in a large calorie deficit during hard training phases. Protein intake should be around 0.7 to 1 gram per pound of bodyweight, and carbohydrates should increase with training intensity to support recovery and immune function. Hydration also matters. Aim for at least half your bodyweight in ounces of water per day, and more if training hard or sweating heavily.

Stress management is often overlooked. If work or life stress is high, training intensity should be adjusted. You cannot max out every area of life at once. A simple rule is that if external stress is elevated for more than 3 to 5 consecutive days, consider reducing training intensity or volume to prevent overload. See the attached blog on breath work for stress releife to gain some insight on how to manage your stress.

Finally, act early on symptoms. At the first sign of fatigue, sore throat, or poor sleep, reduce training intensity by 30 to 50 percent for a few days. Increase sleep, increase hydration, and prioritize recovery. Catching symptoms early is one of the most effective ways to avoid a full illness.

Preventing illness is not complicated, but it requires consistency. When hygiene, sleep, nutrition, and training load are managed with intention, the body becomes far more resilient.

How to Recover Faster When You Get Sick

Even with the best habits, illness can still happen. The goal with athletes and sickness is to shorten downtime and return to training without creating setbacks.

The first step is to reduce training load immediately. Do not try to push through. If symptoms are present, drop training intensity by at least 50 to 100 percent depending on severity. For most athletes, this means full rest for a few days or very light movement only. This allows the immune system to focus on recovery instead of splitting resources.

Sleep becomes your top priority. Aim for 8 to 10 hours per night while sick. If possible, include short naps of 20 to 30 minutes during the day. Sleep is when immune activity is highest, and increasing it can significantly speed up recovery.

Hydration needs to increase as well. A good baseline is half your bodyweight in ounces of water, but when sick, aim closer to 0.7 ounces per pound of bodyweight. Add electrolytes if you are sweating, have a fever, or are not eating normally.

Nutrition should remain high even if appetite drops. Focus on easy to digest, nutrient dense foods. Protein should stay around 0.7 to 1 gram per pound of bodyweight to prevent muscle loss. Carbohydrates are especially important during illness because they support immune function and reduce stress on the body. Even simple foods like rice, fruit, soups, and smoothies can help maintain intake.

Supplementation can support recovery, but it should not replace the basics.

• Vitamin C: 500 to 1000 mg per day can support immune function

• Vitamin D3: 2000 to 5000 IU per day, especially if levels are low or during winter months

• Zinc: 15 to 30 mg per day may help reduce duration of symptoms if taken early

• Electrolytes: help maintain hydration and support recovery, especially during fever

• Honey and warm fluids: can help soothe throat irritation and support comfort

These are supportive tools, not cures. Sleep, hydration, and nutrition will always be the primary drivers of recovery.

Light movement can be reintroduced once symptoms improve. Short walks or very low intensity sessions can help circulation and prevent stiffness, but only if energy levels support it. If symptoms return or worsen, pull back again.

One of the biggest mistakes in athletes and sickness is returning to full training too quickly. Even if you feel better, your body may still be recovering. A good rule is to ease back in over 2 to 4 days, gradually increasing intensity rather than jumping straight into hard sessions.

Recovery is not just about getting rid of symptoms. It is about returning to full capacity without relapse.

Handle it correctly, and you lose a few days.

Rush it, and you can lose weeks.

Final Takeaway

When it comes to athletes and sickness, the biggest mistake is treating health as an afterthought. Many athletes focus on pushing harder, training longer, and doing more, but overlook the one thing that makes all of that possible.

If you are not healthy, you cannot perform.

Train hard when your body is ready.

Pull back when your body shows warning signs.

Prioritize sleep, nutrition, and recovery with the same discipline you bring to training.

Athletes and sickness will always be connected because training itself is a stressor. But when you learn to manage that stress properly, you reduce risk, recover faster, and stay in the game longer.

At the end of the day, the best program is the one you can stay consistent with.

And consistency requires health.