No.
21.
Restless Legs Syndrome
I was in the doctor's office and they were advertising a treament for this.
22.
Seasonal Affective Disorder
Aww boo...it's winter.
23.
24.
The Gout
Perhaps this is funny because it's always preceded by "the."
25.
Mange
It's funny to think of people contracting a dog disease like the mange. Heartworm too.
26.
Ague
As in, "I had the ague."