A weak immune system, also called immunocompromise, occurs when the body's natural defense against infection does not function properly. Common reasons for weak immunity include health conditions like diabetes, cancer, HIV, and autoimmune diseases, as well as medications such as corticosteroids and immunosuppressants. Age also plays a role, with immune function often declining after mid-life. Lifestyle factors like inadequate sleep, poor nutrition, smoking, excessive alcohol use, lack of exercise, and chronic stress can further weaken the immune system. Some people are born with primary immunodeficiencies caused by genetic defects, while others acquire immune weakness later in life due to infections, diseases, or treatments like chemotherapy.
If the immune system feels weak, it is useful to evaluate lifestyle factors, underlying health conditions, and medications that may contribute. A healthcare provider can run tests if needed to identify specific causes or deficiencies for targeted treatment.
