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What is Ebullism and explain in detail?
Ebullism is the formation of gas bubbles in bodily fluids due to reduced environmental pressure, for example at high altitude.  It occurs because a system of liquid and gas at equilibrium will see a net conversion of liquid to gas as pressure lowers; for example, liquids reach their boiling point at lower temperatures when the pressure on them is lowered.

Symptoms
Symptoms of ebullism include bubbles in the membranes of the mouth and eyes, swelling of the skin, and bubbles in the blood. Blood circulation and breathing may be impaired or stopped. The brain tissue may be starved of oxygen because of blockage of arteries, and the lungs may swell and hemorrhage. Death results unless recompression is rapid enough to reduce the bubbles before tissue damage occurs.
In 1960, Joseph Kittinger experienced localised ebullism during a 31 kilometres (19 mi) ascent in a helium-driven gondola. His right-hand glove failed to pressurise and his hand expanded to roughly twice its normal volume  accompanied by disabling pain. His hand took about three hours to recover after his return to the ground.
Tissue samples from the remains of the crew of Space Shuttle STS-107 Columbia revealed evidence of ebullism. Given the level of tissue damage, the crew could not have regained consciousness even with re-pressurization.

Mechanism
In the atmospheric pressure present at sea level, water boils at 100 °C (212 °F)