In general, do not capitalize the names of diseases, disorders, therapies, treatments, theories, concepts, hypotheses, principles, models, and statistical procedures.

The following are some common examples:

autism spectrum disorder anorexia nervosa
major depressive disorder diabetes mellitus
lung cancer leukemia
cognitive behavior therapy bone marrow transplant
object permanence theory of mind
associative learning model law of effect
regression analysis factor analysis

The capitalization of diseases, disorders, therapies, and related terms is covered in Section 6.16 of the APA Publication Manual, Seventh Edition

However, do capitalize personal names that appear within these kinds of terms, as demonstrated in the following examples.

Alzheimer’s disease Rett syndrome
non-Hodgkin’s lymphoma Maslow’s hierarchy of needs
Freudian theory Pavlovian conditioning
Date created: September 2019