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.
Signs of Sunburn. When you get a sunburn, your skin turns red and hurts. If the burn is severe, you can develop swelling and sunburn blisters. You may even feel like you have the flu -- feverish, with chills, nausea, headache, and weakness.A few days later, your skin will start peeling and itching as your body tries to rid itself of sun-damaged cells.f the burn is severe, you can develop swelling and sunburn blisters. You may even feel like you have the flu -- feverish, with chills, nausea, headache, and weakness. A few days later, your skin will start peeling and itching as your body tries to rid itself of sun-damaged cells.