At 19, Mars was diagnosed with ankylosing spondilytus, a degenerative bone disease which causes the spine to stiffen in between the vertibrae. As a result, Mars quotes he is three inches shorter than he was in high school.
Mick Mars has two children with ex-wife Sharon. Les Paul Deal (son, born in August 1971) and Stormy Lynn Deal (daughter, born in September 1973) are grown up now and Stormy has made Mars a grandfather three times over before he hit forty.