1. Sexual foreplay, even if it led to some pre-seminal fluid secretions.
2. Involuntary ejaculations, like wet dreams.
3. Medically required injections, eye and ear drops and medications placed on wounds.
4. Nose or throat bleeding, or bleeding caused by pulling a tooth.
5. Involuntary vomiting.
6. Excessive washing of the nose and mouth during wudoo.
7. Swallowing one's own saliva.
8. Tasting food (when cooking), without swallowing.
9. Taking a bath or swimming.
10. Delaying the purifying ghusl (bath) of janaabah (impurity due to sexual intercourse), wet dream or menstruation till after fajr (dawn) time.
11. Involuntary, forced or forgetful eating or drinking.
12. Using siwaak (toothbrush without tooth paste).
13. Using eye-shadows (kuhl), and applying or smelling perfumes.
14. Eating before Maghrib (sunset) or after fajr (dawn) because of mistake in time recognition.
15. Drawing out blood from the body.

9. WHAT MUST BE AVOIDED DURING FASTING

The fasting person is one who protects his body parts from indulging in sins, his tongue from lying, obscenities and all types of falsehood and his stomach from eating and drinking. Therefore, if he speaks he must try not to speak anything that reduces the value of his fast and if he does any action, he does not do anything to nullify his fast. Thus, his speech will be good and his actions righteous. So the legislated fast is not only the mere abstinence from food, drink and desires, but it is incumbent upon the fasting person to also shy away from any action that would reduce the value of his fast or destroy it, so that he will benefit from his fasting and achieve Taqwaa (Allah consciousness), as Allah (T) said, which means:

"Fasting is prescribed on you as it was prescribed upon those before you so that you may achieve Taqwa. " [Al-Baqarah 2:187]

This Taqwaa can only be achieved by the person who abstains from all evils no matter how small.

Abu Huraira (R) said that the Messenger (S) of Allah (T) said: "Whoever does not avoid false speech and acting on it, Allah (T) does not have any need for him to leave his food and drink". [Bukhaaree]

Abu Huraira said that the Messenger (S) said: "Fasting is not (merely) to leave off eating and drinking, but it is to abstain from vain talk and obscene behaviour". Therefore, if anyone insults you or behaves foolishly towards you, then say: "I am fasting, I am fasting." [Bukhaaree]

For this reason there has reached us strong reprimand from the Messenger (S) for anyone who involves in these types of evil behaviours, he (S) said: "All that some people gets from their fasting is hunger and thirst. " [Ibn Majah, Daramee]

10. THINGS THAT BREAK THE FAST

There are many things that the fasting person must avoid because if he does them during the daytime of the month of Ramadaan his fast would be void, and he would have increased his sins. The following are things that break the fast:

Intentional eating and drinking
Allah (T) said:

{And eat and drink until the white thread of Fajr becomes distinct from its black thread, then complete the fast until the night.} [Baqarah 2:187]

This verse shows that the fasting is abstaining from eating and drinking and therefore whoever intentionally indulges in either of them has destroyed his fast. However, if eating or drinking is done through forgetfulness or being mistaken, or it is done under duress then his fast is still valid and he does not have to make it up.

The following hadeeth establishes this.

The Messenger (S) said: "If anyone forgets and eats and drinks, then let him complete his fast because it is Allah who fed him and gave him to drink." [Bukhaaree and Muslim]

He (S) also said: "Indeed Allah (T) has freed my Ummah from the burden of mistakes, forgetfulness and what they do under duress." [Al-Haakim, Ad Daarqutnee]

Note:
Qadaa (one dayof fasting) has to be made for intentional eating and drinking.

Intentional vomiting
If someone is overtaken by vomit then he continues his fast and completes it to the end of the day it would be valid. If, however he intentionally vomits then his fast for that day is voided. This is based on the following Hadeeth. The Messenger (S) said: "Whoever is overtaken by vomiting then he does not have to make up that day. Whoever vomits intentionally must make up a day." [Abu Dawood, Ibn Maajah, Ahmad]