Forehead pain may be caused by tension headache, sinusitis, glaucoma or lack of sleep. 1. Tension headache: the disease is usually caused by excessive mental tension, emotional excitement, or long-term sleep deprivation, etc. When the tension headache attack, it can show forehead pain, but also accompanied by the head of the feeling of binding, tightness and other manifestations. 2. Sinusitis: due to the existence of inflammatory reaction in the sinus area, under the stimulation of inflammation, leading to increased nasal secretion, resulting in poor ventilation in the nose, may cause frontal pain, may also be accompanied by nasal congestion, runny nose and other symptoms. 3. Glaucoma: when glaucoma acute attack, can lead to patients with increased intraocular pressure, may cause forehead pain, may also be accompanied by blurred vision, vision loss, tearing eyes, photophobia and other symptoms. 4. Lack of sleep: If the recent stress, mental tension, resulting in poor sleep quality, or long-term excessive late-night sleep, etc., are prone to sleep deprivation, resulting in the brain for a long time can not get enough rest, may cause frontal pain, but also accompanied by a sense of drowsiness in the head, mental lethargy and other manifestations. Forehead pain can also be caused by other reasons, if the symptoms continue to be unable to relieve, should seek medical advice as soon as possible, after a clear diagnosis of the cause, by the doctor’s guidance for treatment.