What are some common superstitions about diseases?

There are many superstitions and beliefs about diseases around the world. Some common ones include:

- The evil eye: In many cultures, the evil eye is believed to be a powerful curse that can cause illness or misfortune. It is often thought to be caused by someone who is jealous or envious of another person.

- Breaking a mirror: Breaking a mirror is considered to be bad luck in many cultures. It is believed that it will bring seven years of bad luck, or even death.

- Walking under a ladder: Walking under a ladder is thought to be bad luck in many cultures. It is believed that it will bring bad luck, or even death.

- Black cats: Black cats are often associated with bad luck in many cultures. It is believed that they are witches in disguise, or that they bring bad luck to those who cross their path.

- Friday the 13th: Friday the 13th is considered to be an unlucky day in many cultures. It is believed that it is a day of bad luck, and that it is more likely for bad things to happen on this day.

- Spitting: Spitting is considered to be bad luck in many cultures. It is believed that it will bring bad luck, or even death.

- Touching wood: Touching wood is thought to be a way of warding off bad luck. It is believed that it will protect you from bad luck, or even death.

- Carrying a rabbit's foot: Carrying a rabbit's foot is thought to be a way of bringing good luck. It is believed that it will bring you good luck, or even wealth.

- Throwing salt over your shoulder: Throwing salt over your shoulder is thought to be a way of warding off bad luck. It is believed that it will protect you from bad luck, or even death.

- Whistling in the dark: Whistling in the dark is thought to be bad luck in many cultures. It is believed that it will attract evil spirits, or even death.