ailment

n. illness, sickness; pain, ache, suffering

A disease is an abnormal condition of an organism that impairs bodily functions. In human beings, "disease" is often used more broadly to refer to any condition that causes discomfort, dysfunction, distress, social problems, and/or death to the person afflicted, or similar problems for those in contact with the person. In this broader sense, it sometimes includes injuries, disabilities, disorders, syndromes, infections, isolated symptoms, deviant behaviors, and atypical variations of structure and function, while in other contexts and for other purposes these may be considered distinguishable categories.
See more at Wikipedia.org...

Ail·ment n. A physical or mental disorder, especially a mild illness. [more]Ailment - Community and Resources

Noun
1. an often persistent bodily disorder or disease; a cause for complaining
(synonym) complaint, ill
(hypernym) disorder, upset
(hyponym) pip
(derivation) afflict, trouble, ail, pain

(n.)
Indisposition; morbid affection of the body; -- not applied ordinarily to acute diseases.