If a person has Kalsarpa Yoga in his horoscope, then his life has various kinds of problems like a business failure, education, job, marital problems, dissatisfaction, sadness, frustration, quarrels with relatives or arguing with family etc.
It is only when all the other planets come between the planets Rahu and Ketu that kalasarpa yoga dosh is formed.
If Rahu and Ketu have all the other planets in one part, then the yoga called kalasarpa should be understood. A person born with this yoga is unhappy even if he has wealth and offspring
Article source: https://www.purohitsangh.org/marathi/kaal-sarp-dosh-pooja