Clinically abortion is classified into four types: syndrome of insufficiency of kidney qi, syndrome of asthenia of qi and blood, syndrome of interior disturbance of blood heat and syndrome of external injury impairing collaterals. The basic therapeutic principles are preventing miscarriage, nourishing kidney qi and protecting fetus.

1. Syndrome of insufficiency of kidney qi
Main symptoms: Slight vaginal bleeding with light color during pregnancy, aching sensation in the loins and prolapsing sensation in the abdomen, or accompanied by dizziness and tinnitus, frequent urination, or experience of abortion, light-colored tongue with white fur, deep and slippery or weak pulse over chi region.

2. Syndrome of qi and blood asthenia 
Main symptoms: Slight vaginal bleeding with light color and thin texture, aching sensation in the loins and prolapsing sensation in the abdomen, spiritual lassitude, laccidity of limbs, palpitation, shortness of breath, lusterless complexion, light-colored tongue, white and thin tongue fur, thin and slippery pulse.

3. Syndrome of interior disturbance of bloodheat
Main symptoms:  Fresh vaginal bleeding during pregnancy, or prolapsing sensation and pain in the abdomen, dysphoria and restlessness, scorching sensation over palms, dry mouth and throat, constipation, red tongue,yellow and dry tongue fur, taut and slippery or slippery and rapid pulse.

4. Syndrome of external injury impairing collaterals
Main symptoms: Prolapsing sensation and pain in the loins and abdomen, vaginal bleeding with purplish red color or with small blood clot after pregnancy, light-red tongue, thin, slippery and weak pulse.