Low platelets usually do not cause back pain, but if the low platelets cause bleeding in the organs, it may cause back pain. 1. Platelets have the function of local hemostasis, and low platelets are a common cause of bleeding. The normal value of platelets is (100~300)×10⁹/L, (20~50)×10⁹/L can be mild bleeding, <20×10⁹/L can be more serious bleeding; <5×10⁹/L can lead to serious bleeding. If low platelets lead to bleeding in the organs, it may cause back pain. 2. However, the more common causes of low back pain are lumbar disc bulging, herniation, stenosis, prolapse and other diseases, which are generally not directly related to low platelets. Therefore, the above test results alone can not accurately determine the cause, but also need to be combined with the characteristics of the medical history, other test results in order to make an accurate judgment, it is recommended to clarify the cause of the disease under the guidance of the doctor. If symptoms of low back pain occur, it is recommended to go to the hospital in time for early and regular treatment.