Usage	Your overall health can be assessed by taking into account your current hit points (by typing "score" or "ss") and whether your health has been affected by outside forces such as disease or poison. Every living creature has a certain amount of health that can be determined by looking at them. The very last line of the description gives a brief glimpse at how healthy someone is. However, it does not show if the monster is diseased.
Diseases	There a several types of diseases players can contract ranging from the common cold to rabies. There is no way to tell if you (or anyone else) is sick before the symptoms appear. Symptoms of the common cold include frequent coughing and sneezing or a hoarse voice. Symptoms of rabies include frothing at the mouth and unprovoked attacks. Diseases are transmittable from player to player and from monster to player. If you suspect you are diseased, seek the assistance of a cleric to cure you.
Poison	In your adventures through the realms, you may come across poisonous creatures or vile magicians who will afflict you with a virulent poison. Once afflicted, you will be damaged by the poison until it is purged from your system. The only way to accomplish this is to visit a healer who has the ability to neutralize poison.