Question: what are the causes of headaches

Reference:
 Sinus headaches Overview Sinus headaches are headaches that may feel like an infection in the sinuses (sinusitis). You may feel pressure around your eyes, cheeks and forehead. Perhaps your head throbs. However, many people who assume they have headaches from sinusitis, including many who have received such a diagnosis, actually have migraines or tension headaches. Symptoms Signs and symptoms of sinus headaches - regardless of cause - may include: - Pain, pressure and fullness in your cheeks, brow or forehead - Worsening pain if you bend forward or lie down - Stuffy nose - Fatigue - Achy feeling in your upper teeth Sinusitis or migraine? Migraines and headaches from sinusitis are easy to confuse because the signs and symptoms of the two types of headaches often overlap. Both sinusitis and migraine headache pain often gets worse when you bend forward. Migraine can also be accompanied by various nasal signs and symptoms - including congestion, facial pressure and a clear, watery nasal discharge. In fact, studies have shown that approximately 90 percent of people who see a doctor for sinus headaches are found to have migraines instead. Sinusitis, however, usually isn't associated with nausea or vomiting or aggravated by noise or bright light - all common features of migraines. Sinusitis usually occurs after a viral upper respiratory infection or cold and includes thick, discolored nasal mucus, decreased sense of smell, and pain in one cheek or upper teeth. When to see a doctor Consult your doctor if: - Your headache symptoms occur more than 15 days a month or require frequent over-the-counter pain medicine - You have a severe headache, and over-the-counter pain medicine doesn't help - You miss school or work because of frequent headaches or the headaches interfere with your daily life Causes Sinus headaches are usually associated with migraines or other forms of headaches. Sinus headaches are associated with pain and pressure in the face and sinuses and can cause nasal symptoms. Most of these headaches are not caused by sinus infections and should not be treated with antibiotics. Risk factors Sinus headaches can affect anyone but may be more likely if you have: - A previous history of migraines or headaches - A family history of migraines or headaches - Hormonal changes associated with headaches Diagnosis The cause of headaches can be difficult to determine. The doctor will question you about your headaches and do a physical exam. Your doctor may perform imaging tests to help determine the cause of your headache, including: - CT scan. CT scans use a computer to create cross-sectional images of your brain and head (including your sinuses) by combining images from an X-ray unit that rotates around your body. - Magnetic resonance imaging (MRI). With MRIs, a magnetic field and radio waves are used to create cross-sectional images of the structures within your brain. Treatment Most people who assume they have sinusitis actually have migraines or tension-type headaches. Migraines and chronic or recurrent headaches may be treated with prescription medication that is either taken every day to reduce or prevent headaches or taken at the onset of a headache to prevent it from getting worse. To treat these types of headaches, your doctor may recommend: - Over-the-counter pain relievers. Migraines and other types of headaches may be treated with over-the-counter medications, such as acetaminophen (Tylenol, others), naproxen sodium (Aleve) and ibuprofen (Advil, Motrin IB). - Triptans. Many people with migraine attacks use triptans to relieve pain. Triptans work by promoting constriction of blood vessels and blocking pain pathways in the brain. Medications include sumatriptan (Imitrex), rizatriptan (Maxalt), almotriptan (Axert), naratriptan (Amerge), zolmitriptan (Zomig), frovatriptan (Frova) and eletriptan (Relpax). Some triptans are available as nasal sprays and injections, in addition to tablets. A single-tablet combination of sumatriptan and naproxen sodium (Treximet) has proved to be more effective in relieving migraine symptoms than either medication on its own. - Ergots. Ergotamine and caffeine combination drugs (Migergot, Cafergot) are less effective than triptans. Ergots seem most effective in those whose pain lasts for more than 72 hours. Ergotamine may cause worsened nausea and vomiting related to your migraines and other side effects, and it may also lead to medication-overuse headaches. Dihydroergotamine (D.H.E. 45, Migranal) is an ergot derivative that is more effective and has fewer side effects than ergotamine. It's available as a nasal spray and in injection form. This medication may cause fewer side effects than ergotamine and is less likely to lead to medication-overuse headaches. - Anti-nausea medications. Because migraines are often accompanied by nausea, with or without vomiting, medication for nausea is appropriate and is usually combined with other medications. Frequently prescribed medications are chlorpromazine, metoclopramide (Reglan) or prochlorperazine (Compro). - Glucocorticoids (dexamethasone). A glucocorticoid may be used in conjunction with other medications to improve pain relief. Because of the risk of steroid toxicity, glucocorticoids shouldn't be used frequently. 

Answer: Sinus headaches are usually associated with migraines or other forms of headaches. Sinus headaches are associated with pain and pressure in the face and sinuses and can cause nasal symptoms. Most of these headaches are not caused by sinus infections and should not be treated with antibiotics.