Any planet that is positioned in this house will lose its good energy. The 8th house governs death and longevity, study, covert relationships, delays and hurdles, marriage sustenance, surprising gain or loss, inheritance, and so forth. In a female horoscope, the 8th house is also known as Mangalya sthan, or Husband's Longevity. Here, the word "longevity" should be understood in terms of years, not days. A long life is said to be 100 years old. If you are told that someone is living in his/her 90's, it means that person has spent most of his/her life being taught how to live forever by his/her parents or elders.
Rahu, the Hindu god of intelligence and action, can be considered the male counterpart of Ketu, the Hindu goddess of wisdom and intuition. As the ruler of the 8th house, Rahu affects both men and women, but more strongly on men. In males, Rahu increases the risk of dying early; in females, it can lead to long illness and suffering before death. Whether Rahu is posited in an individual's chart will determine how it affects them. For example, if Rahu is in the 1st house, it will affect one's career path through no effort of one's own. On the other hand, if it is in the 8th house, then one would need to make some effort to improve their health or face early mortality.
It causes a person's life to be filled with anxiety, unhappiness, and bewilderment. So, if it is in the 7th house of a person's horoscope, it will cause troubles in the native's relationships and married life. It has such a great effect that it affects every planet. Rahu has a varied influence on each planet. It can either improve or disturb the status of a planet.
Rahu has a strong influence on mind and intelligence. If it is present in an individual's chart, he/she will experience mental stress. This dosh will also affect one's capacity to think clearly and make rational decisions. Due to this reason, people who are afflicted with this disease tend to have poor judgment in matters of love and marriage.
In addition to this, Rahu brings about physical disorder. If it is present in an individual's chart, he/she will suffer from asthma, epilepsy, fever, and other diseases related to the respiratory system. Also, if Rahu is present in the 7th house, then there is a high probability that the native will be injured in accidents caused by animals. People who are affected by this rasi are vulnerable to snake bites. In fact, if Rahu is present in the 7th house when one signs up for military service, there is a high probability that he/she will be rejected by the recruitment board due to physical disabilities.
Last but not the least, Rahu affects the health in many ways.
According to Vedic Astrology, if their married life is not going well, locals of Rahu in the 7th house may lose their positive and contentment. And if that happens, individuals may get bored of their relationships and wish to divorce them. This may cause a reversal in their life's trajectory, and they may endure difficult times. However, all this is predicted to be true for only one of them, so they can still enjoy their lives despite the fact that something bad may have happened to them.
Here are more details about Rahu in the 7th house: Localization will reveal whether Rahu is in a happy relationship or not. If he/she is not, then it means that their marriage will not go according to plan. They may even experience some conflict between the two houses it occupies (7th and 6th).
If Rahu is in a happy relationship, then it means that things are going well for them personally as well as professionally. They may also receive good news from friends or family members related to the 7th house occupant. Conversely, if Rahu is not in a happy relationship, then it means that their marriage is going through a rough time right now. There may be arguments between the two houses it occupies (7th and 6th), and problems related to the 6th house may also impact its married life.
The planets Saturn, Rahu, and Mars in a horoscope define the Rahu dosha impacts in marriage, and when it is associated to the seventh house, it predicts a marriage against the wishes of the parents and family. People with Rahu in 7th position may suffer losses in business with electrical equipment. They may also experience problems with their spouse or partner.
Rahu is the karaka for separation in Hinduism, therefore, this planet indicates that you will one day be separated from your husband or wife. This does not mean that you should marry someone who has rahu in their chart, because even though this planet represents separation, it also represents change and transformation. So if you are married to someone with rahu in their chart, then they too would be changing and transforming just as you are, which could possibly lead to the end of your marriage.
People with rahu in their charts are likely to be leaders, but such people often bring about changes that others don't like. They may also struggle with other individuals having more power than them, so it is important that such people work towards bringing about changes that benefit everyone involved.
If rahu is placed in the 7th house, then it is considered a very bad omen for marriage. Parents should not allow their children to get married into such unions.