Pain in the groin area when bending over may be related to hip arthritis, hip joint effusion, femoral head necrosis, inguinal hernia, muscle strain and so on. 1. Hip arthritis: Hip arthritis can cause aseptic inflammation in the joint, and a large number of inflammatory factor stimulation will cause groin pain. 2. Hip joint effusion: Hip joint effusion will cause increased pressure in the joint cavity, also causing groin pain. This pain will be aggravated when the hip joint is squeezed when bending over. 3. Necrosis of the femoral head: patients with necrosis of the femoral head have collapsed joint surfaces, and friction with the acetabulum will cause groin pain, and the pressure on the anterior edge of the femoral head increases when bending over, which will cause pain to worsen significantly. 4. Inguinal hernia: when inguinal hernia occurs, when bending over, the intestinal contents are herniated from the hernia ring and pressurized, which will also cause pain. 5. Muscle strain: when the hip joint moves too much during physical exercise, it will cause the muscles, ligaments and joint capsule in the groin to stretch, which will cause pain when bending over. There are many reasons for this symptom, if it is difficult to relieve, it is recommended that patients go to the hospital for medical examination, clear cause of the disease under the guidance of the doctor regular treatment.