There’s a laundry list of medical conditions that not many people know about. Some of them are not considered life threatening, but do make life very difficult. Take this one, for example..
Triphalangeal thumb (TPT)
People who have this condition have thumbs that are not opposable, as shown here. This makes their thumbs unable to touch their other fingers.
For some people suffering from triphalangeal thumb, the thumb will be non-existent or it will be a much smaller nub.
TPT is believed to be mostly hereditary, although research is being done to rule out other causes. It’s an extremely rare condition that only affects 1 out of 25,000 people.