After analyzing the composition of the character 病 disease here, let’s look at the key 疒 associated with other characters. With some basic characters, we can understand some other less frequent characters :
疒 ：+ complete 全 = cure 痊 quán. Healing is the full recovery of health.
+ wind 风 = crazy 疯 fēng. A madman has his brain bothered by the wind?
+ nail 丁= boil 疔 dīng. A boil is like a pimple or a nail that bites.
+ mountain 山 = hernia 疝 shàn. A hernia is a bulge, a mountain can be seen as a swelling on the earth.
+ understand 了 = care 疗 liáo. When we understand the disease, we can cure it.