Besides, the disturbances of autonomic nervous system innervating cerebral arteries is also thought to cause vasospasm. Diagnosis
As only 10 percent of people admitted to the emergency department with a thunderclap headache are having an SAH, other possible causes are usually considered simultaneously, such as meningitis, migraine, and cerebral venous sinus thrombosis. Intracerebral hemorrhage, in which bleeding occurs within the brain itself, is twice as common as SAH and is often misdiagnosed as the latter. It is not unusual for SAH to be initially misdiagnosed as a migraine or tension headache, which can lead to a delay in obtaining a CT scan. In a 2004 study, this occurred in 12 percent of all cases and was more likely in people who had smaller hemorrhages and no impairment in their mental status. The delay in diagnosis led to a worse outcome. In some people, the headache resolves by itself, and no other symptoms are present. This type of headache is referred to as "sentinel headache", because it is presumed to result from a small leak (a "warning leak") from an aneurysm. A sentinel headache still warrants investigations with CT scan and lumbar puncture, as further bleeding may occur in the subsequent three weeks.The initial steps for evaluating a person with a suspected subarachnoid hemorrhage are obtaining a medical history and performing a physical examination. The diagnosis cannot be made on clinical grounds alone and in general medical imaging and possibly a lumbar puncture is required to confirm or exclude bleeding.
Myositis is a rare disease that involves inflammation of the muscles. This can present with a variety of symptoms such as skin involvement (i.e., rashes), muscle weakness, and other organ involvement. You can also have systemic symptoms such as weight loss, fatigue, and low fever. Causes
Injury, medicines, infection, or an autoimmune disorder can lead to myositis. It can also be idiopathic. Injury - A mild form of myositis can occur with hard exercise. A more severe form of muscle injury, called rhabdomyolysis, is also associated with myositis. This is a condition where injury to your muscles causes them to quickly break down. Medicines - A variety of different medicines can cause myositis. One of the most common drug types that can cause myositis is statins. Statins are drugs that are used to help lower high cholesterol. One of the most common side effects of statin therapy is muscle pain. Rarely, statin therapy can lead to myositis. Infection - The most common infectious cause of myositis is viral infections, such as the common cold. Viruses, such as COVID-19, are also shown to be a rare cause of myositis. Autoimmune - Normally, if you get an infection, your immune system attacks the bacteria/virus that is making you sick. In autoimmune diseases, your immune system gets confused and instead starts attacking your body. In the case of myositis, your immune system attacks your muscles. The three main types of autoimmune myositis are dermatomyositis, polymyositis, and inclusion body myositis.