There are many causes of headaches, and sinusitis is one of them. If you have a regular headache, don’t forget to check your sinuses. The sinuses are the air-containing cavities around the nasal cavity formed by the skull that connects to the nasal cavity. There are four pairs of sinuses in the human body, called maxillary sinus, frontal sinus, septal sinus and pterygoid sinus. Because they are located in the head, sinusitis, especially acute inflammation, in addition to nasal congestion, a lot of thick mucus, but also headache. 1, maxillary sinusitis forehead or affected temporal swelling, pressure pain, upper molar pain, light in the morning, heavy in the afternoon, supine or when the pain side to the upper side of the minister, the pain is reduced. Sometimes it can cause pain behind the ipsilateral eyebrow root and eye. 2.Frontal sinusitis It starts as a full headache, and then gradually confined to the affected side of the orbit and the upper corner of the forehead. The pain has an obvious time pattern, and it comes on every morning after waking up, gradually worsens, and is heaviest at noon, gradually relieves after noon, and disappears at night, then repeats the next day. There is obvious pressure pain in the upper corner of the orbit on palpation. 3. Sieve sinusitis Headache is generally mild, with painful areas in the inner canthus of the eye or the root of the nose, and local pressure pain is obvious. Sometimes there is pain behind the eye, which is aggravated when the eye is turned. It can also radiate to the top of the head or the occipital area. 4.Pterygoid sinusitis The pain is mostly located in the posterior part of the eye and can be radiated to the central part of the head or the posterior occipital region, sometimes deep in the head. Patients often feel dizzy, or walk with a feeling of shaking external objects, head heavy, and floating. The initial diagnosis of sinusitis can be made based on the above symptoms, while the diagnosis of sinusitis is mainly based on rhinoscopy, and x-ray film has auxiliary diagnostic value.