Thinking is a gift to mankind, which has enabled him to function with ideas and concepts. Thinking helps us to reason, judge, make decisions and form our opinion. Unfortunately, with the gift of thinking, we are also burdened with the curse of over thinking; which is considered to be one of the deadliest activities of our mind. It is a process where a person persistently mulls over thoughts from past or about some event that may or may not happen in future. Over thinking leads to a condition of analysis paralysis, which hinders choice making to such an extent, that the required action is never taken. The habit of over-analyzing or over thinking not only affects a person emotionally and mentally but also physically, often leading to psychosomatic disorders. This list of 6 deadly effects of over thinking is just the tip of iceberg, as they are many other underlying problems related to this menace which are specific to individual situations.