Why do i get sick at least once a month? i do everything i can to prevent it, but i just keep catching colds and flus and i don't know why. help?

Possible allergies: Allergies can have symptoms that look like a cold(sneezing, runny nose, cough, fatigue) If you improve after 7-10 days then it is probably a cold. Some people can average 5-7 colds per year. Mostly during winter months. There are no remedies that are proven to prevent colds better than simple hand washing. If you have a job where you exposed to many people or kids, you have more risk.

Weak immune system.: You need to strengthen your immune system by eating complete meals 3 times a day with fruit and vegetables, take enough sleep and rest. Avoid stress, Take a flu shot.