Does a high DHT cause prostate problems?

Yes. High Dht (dihydrotestosterone) is associated w/prostate enlargement (and hair loss). Medical solution is 5ari, eg Finasteride (proscar (finasteride) & propecia) or Dutasteride (avodart), which stops conversion of testosterone into dht. But Dht sits on other side of seesaw from e2 (estradiol) so lowering Dht might raise e2, leading to erectile dysfunction + loss of libido. So be very careful!