Palpitation is an awareness of the abnormal beating of the heart. It may occur in people with or without heart problems. Heart palpitations when lying down is not a common occurrence and can be caused by various factors.
Flat feet occur when the normal foot arches have partially or completely collapsed. When the foot is put to the ground the inner or middle side of the foot comes down to the floor rather than remaining raised. This can cause the whole foot to roll inwards (this is called over-pronation).
Excessive pronation (rolling in) as increased pressure is put on the balls of the feet. Injury to the ball of the foot, multiple surgery incisions or fractures can lead to thinning and displacement of the fat pad. Genetics are considered to be a cause behind excessive loss of fat pads on feet. Rheumatoid arthritis, which causes clawing of the toes and more prominent bones in the balls of the feet.