You might remember the meaning of the character 病 with this easy mnemonic:
I was diagnosed with a minor ailment, where I basically experienced sickness (疒) everywhere on my body except for one (一) place. I was throwing up so much into a box (冂) today at work that a man (人) entered (入) my cubicle to see what was wrong with me.
Using mnemonics to remember the meaning of Chinese characters like has a huge impact on how long to learn Mandarin it takes.