Right thigh pain during menstruation may be related to physiological factors such as overwork and excessive exercise, followed by dysmenorrhea, endometriosis and other diseases. 1. Physiological factors: overwork, excessive walking or excessive exercise during menstruation may cause thigh pain. 2. Dysmenorrhea: It mainly manifests as pain before or during menstruation, and the common site is the lower abdomen, which may involve the waist and inner thighs. Its etiology may be related to factors such as increased prostaglandin content and organic pelvic diseases. 3. Endometriosis: patients may experience pain during the menstrual cycle, which is mostly found in the lumbosacral region, deep lower abdomen, and may also radiate to the perineum and thighs, etc. The causes of the disease are mostly related to intrauterine implantation, heredity, immunity and other factors. The causes of right thigh root pain in women during menstruation are more varied, and after excluding physiological factors, patients are advised to go to regular hospitals for consultation to clarify the causes of the disease.