Mercury does well in the 1st House provided it is associated with Sun. Mercury is Prince among the Planets and 1st House represents oneself, the physical, mental and character traits of a person. In that sense the talkative and shirking Mercury is ill-suited if it is alone in the 1st House. Mercury is an impressionable and young Planet according to Vedic Astrology. It takes the characteristics of its co-tenants. Mercury placed alone in the 1st House behaves like a Spoilt Prince who seeks Patronage without Accepting Duties.
1st House is ruled by Sun which is a friend of Mercury. In a horoscope the Sun and Mercury move very close to each other. Hence when Sun+Mercury are in the 1st House then the native does great. If the angle is less then twelve degress then that forms the powerful Budh-Aditya Yoga which gives power, fame, intelligence and splendor. Venus also travels very close to Mercury. So Venus with Mercury in the 1st House gives a chatty, articulate and romantic personality. The native both male or female could be a flirt. But in a friendly sign it also implies that native does great in Business like Selling Perfurmes, Jewelry, Music, Arts, Dancing and other business where feminine grace and splendor are required. Jupiter+Mercury in 1st House may give a great scholar or a very intelligent thug depending on horoscope sign and other associations and aspects. Mercury along with Mars in 1st House is not bad as long as anger and harsh speech are kept in check. It gives quick thoughts and actions and generally ensure success for the native. Mercury with Saturn in 1st House may give negative thoughts and speech but it also gives a calculative and disciplined individual who thinks all the pros and cons of a situation before taking desired action. Mercury along with Rahu in 1st House may give success for few and despair for others depending on horoscope sign. Mercury+Ketu is not bad on a spiritual front atleast though Social Front may need some Social Polishing Skills.
According to B. V. Raman those with Mecury in 1st House: "Have normal health and fame may spread for them. They receive good education and rise to prominent position due to it. Native maybe interested in Occult Studies and if Mercury is afflicted can give severe headache to the native". Mercury in 1st House generally gives dark or brownish complexion and very talkative personality. Mercury natives have a strong desire to rule but hate associated responsibilities associated with ruling. But their articulate speech and general knowledge is sure to make them successful in most endeavors. But they are ill-suited to lead unless other Planets help.
Since Mercury is a planet with Prominent Earth Element it may give Indigestion, Skin Problems, Swellings and Oily Skin. It is advisable to consume more Water, eat food like Lemon Juice, Apples, Green Leafy Vegetables especially Spinach, Honey, Turmeric, Yogurt and other things in appropriate quantity to keep the diseases associated with Mercury away. Also natives should regularly try Jal/Varun Mudra for 5-10 Minutes a day. Regular Pranayam like Anulom Vilom and Kapal Bhati keep Skin Problems and Indigestion in check. Also the natives should regularly do Surya Namaskar in the morning for wholesome health benefits.
Natives with weak Mercury in 1st House are sure to have Skin Problems, Speech Problems and Problems with Indigestion. If such problems occur regularly then keep a fast on Wednesday while only consuming Boiled Mung Beans(Vigna Radiata) once at night time with Lemon Juice sprinkled for flavor and to add digestion. Also they should regularly chant Vishnu Sahasranaam. If it is too difficult then chanting "Om Namah Bhagvate Vasudev" would also suffice. In short prayers to Lord Vishnu are essential to cure weak Mercury. In case one wants to wear a Gemstone the best gemstone is an Green Emerald and that should be wore on Wednesday when Moon is in Ardra Nakshatra, Jyestha Nakshatra or Revati Nakshatra. More on it in article: Mercury Remedies.
Raman, Bangalore Venkata. How to Judge a Horoscope. Delhi: Motilal Banarsidass, 2014. Print.
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