Common cold

Stress and immunity are inversely correlated, which typically means that the more stressed you are, the less efficient your immune system will be. This is true for stress that is more intense or long-lasting.

The immune system can be affected by stress, which might change its ability to fight against diseases. The immune system's changes may also cause the release of substances linked to inflammation. These changes increase the possibility of getting the flu. Reduced immunity makes you more susceptible to diseases like colds and more serious health problems, so if you're under a lot of stress, you could get sick more often. When exposed to a virus, people who are under severe, prolonged stress (lasting more than a month) are more likely to get the flu than people who are under milder stress.