What happens by eating less salt?

What happens by eating less salt?
Salt provides nutrients to human health. People are often advised to reduce salt intake if you are a patient of high BP. But other people also start eating less salt in their food. Which is wrong. Salt gives sodium and chlorine to the body. Which is beneficial for the body. Due to excessive lack of salt, there is a risk of various diseases. Apart from this, it also causes digestive problems. According to some researches, excessive deficiency of salt can cause brain swelling, coma and even death.