Press TV- Prominent Bahraini human rights campaigner Nabeel Rajab has been taken to hospital from prison due to heart problems after being held in solitary confinement for three months.

In a post on his Twitter account, his son, Adam, said that his father was transferred for the third time to a police hospital after suffering from chest pain.

The 52-year-old president of the Bahrain Center for Human Rights�has been repeatedly detained for organizing pro-democracy demonstrations and publishing Twitter posts deemed �insulting� to the Bahraini authorities.

He was pardoned for health reasons last year, but was re-arrested on June 13 following an intensive search of his house in the northwest of the country. Reports suggest he has been subjected to harassment in jail.

Thousands of anti-regime protesters have held numerous demonstrations in Bahrain on an almost daily basis ever since a popular uprising began in the kingdom on February 14, 2011.

They are demanding that the Al Khalifah dynasty relinquish power and a just system representing all Bahrainis be established.

On March 14, 2011, troops from Saudi Arabia and the United Arab Emirates were deployed to Bahrain to assist the Manama government in its crackdown on peaceful protesters.

Scores of people have lost their lives and hundreds of others sustained injuries or got arrested as a result of the Al Khalifah regime�s crackdown on anti-regime activists.