One way is to relate the majors to astrological signs and their rulerships e.g:
Emperor-Aries-The head
Death-Scorpio-The sex organs
The Devil-Capricorn-Teeth and bones
Hermit aside from being ruled by Virgo and thus relating to the digestive system it's the card of an interest in health matters but also hypochondria and signifies someone recovering from an illness as well as every infirmity of old age.
The Magician and The Lovers are both ruled by Gemini but Mag relates more to the brain and the Lovers is linked with the nervous system, the respiratory system and tests for diseases.
I know the 10 of Wands means sickness (as in being sick) I don't know if all the tens relate to similar bugs or viruses.
Fool-Hysteria
High Priestess-Body fluids
Chariot-Accidents, wheel chair users
Justic-Libra-Kidneys and lubar regions
Strength-Good constitution OR be aware of your health
Hanged Man-Drug addiction
Temperance-A combination of treatments are required
The Devil-Deep depression
Tower-Nervous breakdown
Moon-I've known this to be an abortion
All pents-The Body
2 Pents-Paranoia, the eyes
4 P-Constipation
Five of Pents-The questioner is in a state of illness right now (had it for a broken leg)
9 Pents reversed-Cancer
Q Pents reversed-Problems with hearing
All Wands-Stress and inflamations
Ace Wands rev-Erectile difficulties
6 wands reversed-Personal hygiene
9 Wands-The strongest card of the minors, good resistance to infection but also a state ofparanoia
Cups-Emotional states
The 4 of Cups could be nausea, it can also mean disgust at ones own symptoms
8 Cups-Antidepressants
9 Cups reversed-Overdose?
Swords-Afflictions which effect the mind
Ace Swords-The time I got this for death it jumped out really strongly, usually I think it either means the need for surgery or ironically-triumph over illness
3 S-Psychological problems
4 S-A diagnosis
6 S-Ease of symptoms
7 S-An unusual or tropical disease, a disease which is misdiagnosed
8 S-I can tell you from my own experience this relates to obsessive compulsive disorder and/or social anxiety
9 S-Womens troubles (conception difficulties etc)
10 S-Paralysis