When Started
Around five thousand years ago, one of the greatest saint of India , Sri Vyasadeva wrote down the Vedas for the first time. The Vedas also included a branch called Ayurveda that means  “The Science of Life”. It is the oldest and most holistic health system available to human beings today. This ancient wisdom of healing, prevention and longevity was a part of the spiritual tradition of a universal religion before it was written down in texts.

Spread to china with Buddhism
According to many scholars knowledge of Ayurveda originated from India and influenced the ancient Chinese system of medicine and medical system. Thus, Ayurveda is also known as the Mother of all Healing.

Rig Sam Yajur Atharva  Five Elements Earth Water
Indian art of healing, Ayurveda is believed to be as old as the religion of Hinduism. Which was Transferred to Buddhism and Jainism It went to china though Buddhism and formed basis of Chinese medicine which is also based on mercury vasma. Jainism proscribed eating of root of plant like onion,garlic etc.
The complete knowledge of Ayurveda along with spiritual insights of virtue and self-realization was placed in written form over 2000 years ago in Vedas. The four main Vedas included topics like health, spiritual living and behavior.
These four Vedas are Rig, Sam, Yajur and Atharva Veda. Ayurveda was a sub section attached to the Atharva Veda. This sub section dealt with the diseases, injuries, fertility, sanity and health. All the secrets of life were revealed in the first Veda i.e. Rig Veda. Rig Veda shows the discussions on the three doshas-Vat, Pita and Kapha and the use of various herbs to cure the diseases. It also included the five elements of creation, namely, the earth, water, fire, air, Sky ether that forms the basis of all forms of life. It consists of three aspects of Ayurvedic knowledge known as the that includes cause of illness, symptoms and treatments of the disease. These tri-sutras were further elaborated in eight divisions of Ayurveda and were listed down in Atharva Veda.

Further Development
Around 1500 B.C. Ayurveda grew into a respected and widely used system of healing. During this time it was divided into eight specific branches of medicine. The two schools of thought also came into existence at that time and they were Atria- the school of physicians and Dhanvantri- the school of surgeons.

Two School Atria
The state of the art of ancient healing was enhanced by the myths and legends of the  God of healing, Divides Dhanvantari. It is believed that Dhanvanatri, who later wrote down the text of Ayurveda, taught the science of medicine to the sages. According to another legend, the knowledge of healing originated from Brahma who taught it to Daksha, who further taught Indra.

Brahma To His son Daksha To His Grandson Indra To Bharadwaja To Atria To Agonies
It is said that When diseases and death started creating havoc, all great sages gathered in order to find solution to this havoc-creating problem. During this meeting sage Bharadvaja came forward to learn this art of healing from Indra. He then taught this science to Atria- who further transmitted this knowledge throughout world. Later Agonies who was foremost among the disciples of Atria wrote Agnivesha Samhita- the most comprehensive form of Ayurveda. The oldest compilations of Atria and Agnivesha are lost. There are three main re-organizers of Ayurveda whose works still exist and in use. These works were compiled in texts of Charaka, Sushruta and Vaghbata Samhita.

Charaka Sushruta Vaghpata
Charaka was the first man who based his Samhita on Agnivesha Samhita and enlarged it with his interpretations and annotations. Sushruta based his Samhita on the Dhanwantri school of Ayurveda.
Vaghbata compiled the third treatise called Ashtanga Hridaya that is a concise version of both the works of Charaka and Sushruta Samhita. These texts still contain the original and complete knowledge of the Ayurvedic world of medicine.
Charaka Samhita represented the Atria School of physicians that shows discussions on physiology, anatomy, etiology, pathogenesis and symptoms of diseases. In brief it included the internal and external cause of illness. According to Charaka the first and the main cause of illness is the loss of faith in the divine.

Change of satwik to tamsi nature which US president Mr. Bush is talking as reason for food shortage in USA 
Sushruta & Charka samhita developed Nari Pariksha to see through human body
Sushruta Samhita comes from the Dhanvantari School of surgeons. The Samhita contains details and discussions of various surgeries, burns, fractures, wounds and amputation. In includes the complete discussion of the human anatomy. The first science of massage of vital body points originated from Sushruta Samhita. Of all the treaties available Charaka Samhita is considered the best. It consists the details about the elements of Ayurvedic therapeutics and is also the only work that covers Ayurveda comprehensively.
Ayurveda developed Nari Pariksha with three fingers which can see through the body

Decline of Ayurveda and repromotion
Ayurveda went through a period of decline in India during the period of  Muslim & British rule. Who promoted their own medical practice like unnani medicine or Allopathic. It became a second option that was used by traditional spiritual practitioners and the poor. This decline was for a period. of 500 Year1947, when India got independence, Ayurveda again gained importance and many new schools were established. Govt established Ayurveda Medical collage and research center all over the country as per the Allopathy (See the list). Till date Ayurvedic medicine has continued to evolve its holistic approach to health in order to cope with modern needs and scientific approaches of the day.
Modern Ayurveda includes:

Treatment Addiction  rejuvenation  Weight loss  Self healing  Infertility  Beauty

• Principles of preventive healthcare for the entire family (kulam svastyam kutumbakam).
  
• Treatment of addictions (sangakara chikitsa).
  
• Purification and rejuvenation treatments (panchakarma chikitsa).
  
• The Ayurvedic approach to diet and weight loss (sthaulya chikitsa)
  
• Musculoskeletal system treatments (vatavyadhi chikitsa).
  
• Promotion of self-healing and resistance to disease (svabhaavo paramavaada).
  
• Male and female infertility (vajikarana).
  
• Beauty and cosmetic treatments for men and women (saundarya sadhana).