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50 described cases (as of 2015) [ 1] Short-lasting unilateral neuralgiform headache with conjunctival injection and tearing ( SUNCT syndrome) is a rare headache disorder that belongs to the group of headaches called trigeminal autonomic cephalalgia (TACs). [ 1] Symptoms include excruciating burning, stabbing, or electrical headaches mainly near ...
A thunderclap headache is a headache that is severe and has a sudden onset. It is defined as a severe headache that takes seconds to minutes to reach maximum intensity. [1] [2] Although approximately 75% are attributed to "primary" headaches—headache disorder, non-specific headache, idiopathic thunderclap headache, or uncertain headache disorder—the remainder are secondary to other causes ...
Beat (acoustics) In acoustics, a beat is an interference pattern between two sounds of slightly different frequencies, perceived as a periodic variation in volume whose rate is the difference of the two frequencies. With tuning instruments that can produce sustained tones, beats can be readily recognized.
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Orthostatic headache is a medical condition in which a person develops a headache while vertical and the headache is relieved when horizontal. [ 1][ 2] Previously it was often misdiagnosed as different primary headache disorders such as migraine or tension headaches. Increasing awareness of the symptom and its causes has prevented delayed or ...
It's typically a good thing when a new device makes another similar, older product completely obsolete, as we saw recently with Amazon's much-improved second-generation Echo Buds. And the same ...