少年魏谦，十三四岁没爹没娘，带着个拖油瓶小妹妹，艰难地生活，还捡到了死皮赖脸缠上了他的流浪儿一个，起了个名叫小远。 魏谦做梦都想出人头地，是个要钱不要命的钱串子，他的前半生都在铜皮铁骨地逆流而行，以功成名就为第一要务，好不容易稍微混出点头来，自以为看到了命运的曙光，谁知道小远突然犯起了神经病。
Neuropathy - disease or dysfunction of one or more peripheral nerves, typically causing numbness or weakness googling a definition is just as easy as google translate
少年魏谦，十三四岁没爹没娘，带着个拖油瓶小妹妹，艰难地生活，还捡到了死皮赖脸缠上了他的流浪儿一个，起了个名叫小远。 Wei Xian, a teenager, orphaned at thirteen-fourteen years of age, with a younger sister dragging him down, lives a life of hardships. He even picked up a street urchin that had shamelessly stuck to him, and named him Xiao Yuan. 魏谦做梦都想出人头地，是个要钱不要命的钱串子，他的前半生都在铜皮铁骨地逆流而行，以功成名就为第一要务，好不容易稍微混出点头来，自以为看到了命运的曙光，谁知道小远突然犯起了神经病。 Even in his dreams Wei Xian dreamed of being successful, he is a money-oriented person who can disregard his life for money. In the first half of his life, he worked hard in a harsh place so that he could become the number one person (in the area?). Finally, he had a little bit of success and thought that he could see the dawn of fate (I think it's supposed to be 'a new dawn'?) when out of nowhere Xiao Yuan was diagnosed with neuropathy. Not sure if the 神经病 is supposed to be neuropathy or mental illness (精神病) Red font translations suck haha
in China we use 神经病 to describe something is wrong with someone's head or someone does anything that is socially not acceptable. it does not necessarily have something to do with mental illness. a brief google search tells me that this is a BL novel, and most likely this 神经病 here is talking about MC likes man.