Yeah, sadly just by looking at a picture or video or even less a lot of times. I hated this way of seeing people for years because I can't turn it off. I thought it would have been much cooler to see the future or dead people, lol. Most people don't want to know what is wrong with them and even sick people who ask me get upset often when I tell them.
Organs work in harmony so if one is weak for long it hurts others too. Chinese medicine is the closest to what I see.