When one cracks a knuckle, the stretching of the capsule lowers the pressure inside the joint and creates a vacuum which is filled by the gas previously dissolved in the synovial fluid. This creates a âbubbleâ which then bursts producing the characteristic âpoppingâ or âcrackingâ sound.
DOCTORS: Click here for the Professional Version. Burns are injuries to tissue that result from heat, electricity, radiation, or chemicals. Burns cause varying degrees of pain, blisters, swelling, and skin loss. Deep, extensive burns can cause serious complications, such as shock and severe infections. Small, shallow burns may need only to be kept clean and to have an antibiotic cream applied.
1 Pre-cancerous growths are also fostered by sunburns. 2  This is one of the extremely harmful effects of sunburn. 3  Sunburns can cause skin blistering, chills and fevers, temporary pains and redness of the skin. 4  Photosensitive reactions may also occur due to overexposure to the harmful radiation of the sun.