Erectile dysfunction (ED) is the persistent inability to achieve or maintain an erection sufficient for satisfactory sexual activity. It can result from physical causes such as cardiovascular disease, diabetes, high blood pressure, hormonal imbalances, nerve damage, or medication side effects, as well as psychological factors including stress, anxiety, depression, or relationship issues. Because erections depend on healthy blood flow, nerve function, and hormonal balance, ED is sometimes an early warning sign of underlying cardiovascular problems. Symptoms may vary in frequency and severity, ranging from occasional difficulty to consistent impairment. Treatment depends on the underlying cause and may include lifestyle changes, counseling, oral medications, hormone therapy, or other medical interventions, with proper evaluation important to address both symptoms and overall health.