Ask the doctor

Why do I feel dizzy so often nowadays? Dear Doctor; Of recent, I have developed a tendency of feeling dizziness sometimes and everything seems black for a few seconds. It happens when I stand up. Initially, I thought it was lack of enough water when I nearly blacked out while standing up from my seat. But when it recurred several times during the day, I feel something is not right. Edgar, 69.
The New Times
Times Reporter