When I was young before I came to the US we had guests in our apartment, Lagera, in Bulgaria.
A friend of my mother's or maybe it was my father's I really don't remember stayed as a guest after they had finished work. Anyway I was awake late at night and I had spoken with her during the daytime. She approached me in the living room and said "Oh God I have a fever from the cold. What should I do?? I have work tomorrow."
I told her that I think many diseases start from the lower body. She should put her feet in a bucket with salt and hot water running from the faucet in our bathroom. I told her that I think she might feel mild pain for a few minutes. It goes away. She continues running hot water into the bucket to keep it hot which overflows with the water going down the drain for 30 minutes to an hour at most. Then for her to dry her feet with a towel apply rubbing alcohol on them followed by putting on wool socks and last falling asleep in the guest room with lots of blankets. (We didn't have heating in Bulgaria this was the 90's.) By early morning her fever went away and I overheard her speaking with my father and mother. "Tosi chuvek moje da stane strahoten lechitel." [This person could become a great Doctor in his future.] She continued speaking "Nyama da povyarvate kak se chustvam vuv momenta." [You won't believe how I feel right now.] My father finally interrupted her and said that it's Saturday.
I never really learned much about medicine and I am no medical professional so everything I say can be taken extremely lightly but my method at removing her fever worked well. She didn't even sweat at night (I went in the guest room a few minutes after she had left it in the morning and noticed that the blankets were dry.) I guess a professional General Doctor would need to provide an explanation as to why this worked for my parents' colleague. (They had been friends since high school and there was something wrong with her apartment so she had asked them if she could stay at ours.) She had drank something cold and didn't think it would do anything before arriving to our apartment.
As summer is almost over and I've noticed the weather is colder I thought I would write this early. It might help people to not miss a day of work if you have a cold that you notice late at night after work. Some people work outside and others carelessly drink a cold fluid or we used to in the 90s near winter. Your sinuses start clearing up during the time your feet are in the bucket while running hot water from the bathtub faucet and you begin noticing that it's working. You should wear clothing for your upper body and shorts while doing this.
Later on the word spread and everyone in Bulgaria started doing this.