Erectile dysfunction and the feeling of reduced penis size during erection can happen when the erection does not become fully firm or last properly. Poor blood flow, stress, anxiety, low confidence, diabetes, smoking, obesity, lack of exercise, hormonal imbalance, poor sleep, excessive masturbation in some cases, or long-term health conditions may all contribute. Sometimes the penis may only appear smaller because the erection quality has reduced, not because the actual size has permanently changed. Weight gain around the lower abdomen can also make the penis look less visible. Improving overall health often helps sexual performance gradually. Regular physical activity, better sleep, stress reduction, stopping smoking, limiting alcohol, and maintaining good blood sugar and blood pressure control can support better blood circulation and erections. A healthy diet rich in fruits, vegetables, nuts, and protein may also help. Avoid using unverified oils, pills, or enlargement products advertised online, as they may be harmful. Since the problem has been continuing, it is a good idea to consult a doctor for evaluation of hormone levels, circulation, and other possible medical causes so that proper treatment can be planned safely.