Low estrogen in men does not usually have obvious signs, but women with low estrogen may experience menstrual disorders, hot flashes and night sweats, and lower back pain. Signs of low estrogen in men: The amount of estrogen in men’s bodies is already relatively low, so when estrogen is low, there are basically no special clinical manifestations in the body. Signs of low estrogen in women: 1. Menstrual disorders: low estrogen is common in patients with ovarian failure, which often results in menstrual disorders. 2. Hot flashes and night sweats: when the estrogen level decreases, it will affect the vasoconstriction function, which will affect the normal sweating of the human body, and may cause women to have symptoms of hot flashes and night sweats. 3. Low back pain: estrogen and calcium absorption have a great relationship, when estrogen decreases, it may cause the human body to reduce the calcium content, resulting in the symptoms of low back pain. If the above symptoms occur, it is recommended to go to the hospital as soon as possible for relevant examinations to avoid delaying the condition.