London, May 24 (IANS): Pop star Lady Gaga has undergone a test to determine if she suffers from lupus, a genetic disease that killed her aunt.

The "Poker Face" singer has sought medical advice for a string of health problems suffered last year including breathing difficulties, blurred vision, stress and headaches and she has since been tested for lupus, which causes the immune system to attack the body and killed her father's sister Joanne when she was 19, reports contactmusic.com.

"Yes (I have been tested). But I don't want anyone to be worried... I have heart palpitations... but it's Ok. It's just from fatigue and other things. I'm very connected to my aunt, Joanne, who died of lupus. It's a very personal thing. I don't want my fans to be worried about me," she said.

The 24-year-old also revealed she has been taking pills to help her deal with the pressures of fame.

"(I use) prescription medicine. I can't control my thoughts at all. I'm tortured. But I like that... It's good to be tortured. The thoughts are unstoppable but so is the music. It comes to me constantly," she said.