cycling problems: kne injury, Achilles tendon injury, broken collar bone, etc.

I've been a cyclists form many years and have also encountered a lot of problems. I will try to share with you the most common ones.
1. knee injury
2. Achilles tendon injury
3. broken collarbone
4. cuts and bruises
5. crash
6. puncture
7. overtraining/fatigue syndrome
8. mononucleose
9. asthma
10. lack of magnesium, ferrum
This is a mixture of the most common bike problems. I've put not only health problems but also the mechanic ones. If you have encountered some other common problems please write a comment or send an email.