Can I apply for a patent for the treatment of diseases?

Legal analysis: you can't apply for a patent for treating diseases. If a new drug that can effectively treat arthritis is invented, you can apply for patent protection for it.

Legal basis: Article 25 of the Patent Law of People's Republic of China (PRC) does not grant a patent right for the following matters: (1) Scientific discovery; (2) rules and methods of intellectual activities; (3) Methods of diagnosis and treatment of diseases; (4) Species of animals and plants; (5) substances obtained by nuclear transformation; (six) the design of the pattern, color or the combination of the two.