If a patient has a throbbing pain on the left side of the head, consider the following reasons: First, if the patient often has a throbbing pain on one side of the head, consider it to be caused by migraine. Migraine is a relatively common type of primary headache in clinical practice, often triggered by bad mood, lack of rest, stress, mental tension or stimulation by diet or medication. In the second aspect, a throbbing pain on the left side of the patient’s head, if it is in the posterior occipital region, should also be considered to be caused by occipital neuralgia. Occipital neuralgia can stimulate the patient’s occipital nerve when the patient gets cold or has improper posture or cervical spondylosis, causing the patient to have episodes of throbbing pain in the back of the head, which can worsen when the patient coughs or walks.