It is important to note that sinusitis headache is not the only symptom of sinusitis. If it is indeed sinusitis, you will experience inflammation and tenderness of tissues around the eyes resulting in swollen eyelids and red eyes. Aside from this, there can be a loss of smell from a congested nasal passage. Migraine headaches are often caused by the changes in the shape and size of the blood vessels that are found in the head. The blood vessels may expand or an inflammation may occur in the tissues that are found in that area. As to what exactly causes this to happen in such an unsystematic way, no one knows yet. Lack of sleep and bad sleeping habits. Without enough sleep, your body is always tired. Muscle tension can build up which leads to headaches. Try to get enough hours of sleep and make sure that you eliminate bad sleeping habits such as using too many pillow or pulling a blanket over your to avoid having a headache. This is not a disease but merely an inconvenience one will feel for a period of time. Doctors refer to this as a tension headache. When this happens for a short period of time, it is known as episodic. Should this last more a number of days, this is known as chronic. Research has not been able to pinpoint the cause of tension headaches. Once you have undergone this treatment, the doctor will strictly monitor the possible side effects like lethargy, drastic weight gain, hallucinations, memory impairment, and water retention. While taking in this medication, make sure that you don t combine it with any weight loss products. For starters, make sure that you are taking in low doses first before taking in large dose under prescription to test if it s working correctly. Considered as a common complaint during pregnancy, specifically during the first and third trimesters, doctors say it is rarely a signal of a serious problem. During pregnancy, experts say that the possible cause of headache during this time is quite uncertain. In the first trimester, headaches occur because of hormone changes you experience while in the third trimester, headaches are felt because of your having to carry additional weight and changes in your usual posture.