There are many causes of head pain on the left side of the back of the head, the common causes are mainly the following: 1, occipital neuralgia, the disease is due to muscle strain in the neck to stimulate the surrounding blood vessels and nerves, resulting in paroxysmal needle-like pain in the back of the head, the symptoms often last for a few seconds to tens of seconds, generally not more than a minute, taking gabapentin capsules can symptomatically relieve pain symptoms; 2, intracranial tumors, such as meningioma, brain The pain can also be caused by the pain in the back of the head, and in severe cases, it can also cause jet vomiting or even coma. 3, cerebral vasospasm, which is caused by the continuous contraction of the intracranial arteries, mostly seen in patients with high mental stress, overwork and emotional anxiety, can also cause the symptoms of pain in the back of the head. Severe cases will also have memory loss, inattention, insomnia, tinnitus and other clinical manifestations, taking Nimodipine tablets, Cipro can relieve cerebrovascular spasm.