How harmful is self medication to small health issues that i have?

Hai.Is it very harmful if i medicate myself for simple health issues that i have?

Taking pain killers without consulting doctors can lead to bleeding in the stomach, headaches, high blood pressure, calcium loss, etc.

When taken without any prescription, the cough syrups cause sleepiness, dry mouth and other health problems.The antibiotics are administered without a doctor’s prescription leading to infections in the respiratory tract.

People believe that Ayurvedic or herbal medicinal items are safe to use.

The truth is that if you have some kind of allergies or are taken without any prescription they are dangerous too.Generally speaking, people can not subdivide among chest painand heart pain, and thus rely on wrong drugs alone, which is very dangerous.