Severe calcium deficiency in women usually shows signs such as excessive sweating at night, leg and foot cramps, back pain, loose teeth, and abnormalities in the brain and nervous system. If a woman experiences any of these symptoms, she must go to the hospital in time for examination and treatment under the guidance of her doctor. 1. Excessive night sweating: Severe calcium deficiency leads to lower blood calcium concentration and sympathetic nerve excitation, which will lead to night sweating. 2. Cramps in legs and feet: Severe calcium deficiency can cause increased neuromuscular excitability, and sometimes cramps in legs and feet may occur during exercise or at night when resting. 3. Low back pain: severe calcium deficiency may cause osteoporosis leading to spinal deformation and forward tilt, resulting in low back pain. 4. Loose teeth: Severe calcium deficiency will lead to a decrease in bone mass, which will be manifested in the teeth and lead to loose teeth. 5. Brain and nervous system: Severe calcium deficiency may lead to hypocalcemia, resulting in dizziness, blurred vision, insomnia and other symptoms. If any of the above symptoms occur, you should consult a doctor in time.