Tweek suffers from Attention Deficit Disorder. The Stick of Truth is that his parents lace his coffee with Meth, which he drinks like water. Whenever they think he needs to calm down, they just give him more coffee. He suffers from severe anxiety, insomnia, constant panic attacks and paranoias. He suffers from 'twitches', without a definitive cause. "He twitches similar to Rebecca Cotswolds or Thomas, which is likely caused by all of the coffee he drinks. 

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