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Scraping a chalkboard (also known as a blackboard) with one's fingernails produces a sound and feeling which most people find extremely irritating. The basis of the innate reaction to the sound has been studied in the field of psychoacoustics (the branch of psychology concerned with the perception of sound and its physiological effects).
Gua sha, or kerokan (in Indonesia), is a traditional Chinese medicine (TCM) practice in which a tool is used to scrape people's skin in order to produce light petechiae. Practitioners believe that gua sha releases unhealthy bodily matter from blood stasis within sore, tired, stiff, or injured muscle areas to stimulate new oxygenated blood flow ...
The condition can cause localized pain, discoloration (paleness), and sensations of cold and/or numbness. When exposed to cold temperatures, the blood supply to the fingers or toes, and in some cases the nose or earlobes, is markedly reduced; the skin turns pale or white (called pallor) and becomes cold and numb.
Paresthesia, also known as pins and needles, is an abnormal sensation of the skin (tingling, pricking, chilling, burning, numbness) with no apparent physical cause. [1] Paresthesia may be transient or chronic, and may have many possible underlying causes. [ 1 ]
Scalp psoriasis can also cause flakes and even cracks to form in the skin on the scalp, Dr. Rodney says. Folliculitis This is what happens when the hair follicles become infected and inflamed, Dr ...
Making sure you’re up to date with your COVID vaccine is important, Russo says. If you’re considered high risk for severe disease, he suggests wearing a mask in crowded indoor and poorly ...
For many decades, the physical mechanism that causes the cracking sound as a result of bending, twisting, or compressing joints was uncertain. Suggested causes included: Cavitation within the joint—small cavities of partial vacuum form in the synovial fluid and then rapidly collapse, producing a sharp sound. [7] [8] Rapid stretching of ...
Dementia is a devastating condition that impacts up to 10 percent of older adults. And while there's no cure, getting diagnosed early can help patients get on a treatment plan and families prepare.