Is it true that if you have one disease, you can't getanother?

False: Many times more than one disease affects the same person at the same time (what we call co-morbidity). For example, many people suffer from diabetes, high blood pressure, high cholesterol, obesity, etc at the same time. One role of physicians is to prevent these co-morbidities &/or treat these multiple disease entities to improve a patient's quality of life.

Sorry but false: There is no rule in the human body handbook that states that you can only get one disease at a time.

Need more info: It depends on the condition and the cause. Some infections can offer immunity afterward, like varicella (chicken pox). Others, can cause infections over and over again (rhinovirus, the common cold). For non-infections conditions, like diabetes, there can be increased risk for infections or other health conditions if it is not controlled. Your health provider can give more specific advice.

More the opposite!: Not only is this not true, but in many cases having one disease increases the odds of getting another.For example, having diabetes significantly increases the risk of cardiovascular disease. Having parasites often leads to food allergies which can lead to other health problems.Having chronic infections lowers immunity increasing risk of other infections. Treat any disease to reduce risk of others.