Disease is a term that refers to a malfunction of the system, whether that system is a plant, animal, human, or something else. Some forms of disease can be cured with specific treatments while other forms are considered incurable. A disease can be minor or deadly, and at any place in between. A common cold is a disease, and so is AIDS and cancer. .
As to diseases, make a habit of two things - to help, or at least, to do no harm
When a lot of remedies are suggested for a disease, that means it can't be cured