There are many reasons for the throbbing pain in the left side of the head, the specific analysis is as follows: 1, stimulation, such as fatigue, cold, fear, stress and other stimuli will appear in the head paroxysmal throbbing pain, generally belong to the temporary, good rest, relaxation, massage, acupuncture, physiotherapy can be restored. 2, cervical spondylosis, cervical spine prolapse or osteophytes lead to compression of the nerve or spinal cord throbbing pain, will be accompanied by dizziness, nausea, vomiting, back pain.