A preexisting condition is any injury, illness, or medical condition that existed before the procedure in question was performed. These conditions can include:
Physical or mental injuries from a previous unrelated accident, such as broken bones, brain damage, or psychological trauma
Healing or improperly healing injuries (especially those to the joints, spine, or neck)
Congenital abnormalities, or birth defects, such as blood disorders, tachycardia, and cystic fibrosis
Medical conditions that are aggravated by or appear under stress, like asthma and epilepsy
Allergies to medication
In a medical malpractice case, relevant preexisting conditions are the ones that would affect the harm done in the instance of malpractice.