Astrology can be used for many things, including your health! In astrology, the different Zodiac signs and planets rule different parts of the body and health issues.
When a transit (moving) planet hits one of your planets, it can affect not only the area of life the planet rules, but also the part of your body the planet governs as well. Conjunct (aligned) and it can amplify existing issues, while the challenging aspects (squares and oppositions) can make them worse or bring out new ones.
The beneficial aspects (sextiles and trines) can be periods of improvement and you can see things get better with whatever the natal planet rules.
The signs on the cusp (the beginning of the house) of your 1st and 6th houses (houses of the self and of health, respectively) can also show health issues you’re more prone to having, as well as any planet within those two houses. The Sun can also sometimes show health issues since this is a ruler of the self.
There is also a body called Chiron, which is dubbed the wounded healer; it rules our wounds and healing abilities. Chiron also is a health ruler, so you can look at the sign and house location of your natal Chiron, and any conjunctions it makes or other close aspects. Chiron doesn’t move fast, so the house location and close aspects might matter more for you than the sign, but this can vary from person to person.
When your 1st and 6th houses change signs in your progressed chart, this can show changes with your health as well. The progressed chart adds one day to your date of birth for every year you’ve been alive to create a new chart reflecting your maturation and growth, and can be used in predictive analysis.
If any progressed planets enter your natal or progressed 1st or 6th houses, this can also have an impact on your health.
Here’s a list of some body parts and health issues each sign/planet rule:
Aries/Mars – All about the head – acne, eyes, face, scalp, brain, headaches, dizziness
Taurus/Venus – All about the throat – coughs, chin, neck, thyroid gland, voice and vocal cords
Gemini/Mercury – hands, wrists, arms, shoulders, hay fever, lungs, breathing, nervous system
Cancer/Moon – All about the chest – breasts, chest cavity, pancreas, stomach, gas, ulcers, tumors
Leo/Sun – back, spine, exhaustion, heart, inflammations (note that the sun also rules the body itself as a whole, so transit aspects to the sun can impact you overall as well)
Virgo/Mercury – All about the abdomen – bowels, intestines, diarrhea, constipation, digestion, assimilation, solar plexus
Libra/Venus – adrenal glands, buttocks, diabetes, kidneys
Scorpio/Pluto – rectum, colon, bladder, organs of elimination, PMS, menstruation, STD’s, organs of reproduction
Sagittarius/Jupiter – hips, liver, sciatica, thighs, upper legs
Capricorn/Saturn – bones, joints, arthritis, knees, rheumatism, gall bladder, gall stones, skin, psoriasis, itching, eczema
Aquarius/Uranus – All about lower legs – ankles, calves, circulation, cramps, spasms, varicose and spider veins
Pisces/Neptune – colds, feet, bunions, corns, lymphatic system, poisoning, toxicity, drugs, nerves
Suggested Reading: Critical Planets & Your Health