Back pain, weakness, drowsiness and sleepiness may be related to pregnancy and overwork. 1. Pregnancy: When women of age, who are sexually active and have not used contraception, experience symptoms such as back pain, weakness, drowsiness and drowsiness, accompanied by delayed menstruation, it is considered that pregnancy is highly probable, and pregnancy tests or blood HCG tests can be used to clarify the situation. 2. Excessive exertion: when working for a long time, after activities, especially long time to keep bending posture, due to the excessive physical and mental exertion, may appear back pain, weakness, drowsiness and drowsiness and other symptoms. Back pain, weakness, sleepiness and drowsiness can also be caused by other diseases, it is recommended to go to the hospital in a timely manner to clarify the cause of the disease, so as not to delay the condition.