How would someone cure a plague for example the black plague without any modern medicine?

the only thing you could do is flee to a cold region where the carriers, fleas, cannot survive, or isolate yourself from all people & animals.

no known cures but i read somewhere they used to lance the boils and the infected blood drain but dont know if its true

You could try what they did in the 1700s with smallpox; take some of the infected tissue from dead people and inject a little bit of it in your skin. This probably wouldn't work, but the idea is that it would generate immunity to the disease, instead of the disease itself. With that being said, even with today's modern medicine, if another Black Plague (Hanta virus) hit again, we would still be totally screwed. That particular disease can kill in 1-3 days and nothing can prevent it. With modern travel, it would spread worldwide in less than a week. It would be bye-bye for humans.

there are different issues with different types of medical services. there exist 150+ types of alternative care. some types are mostly about pain management , in my humble opinion, like acupuncture. through the stimulation of the lymphatic system, and release of endorphins. and perhaps acupressure. other types that are mild manipulation like massage, it mostly to increase blood flow, also cupping. other types like chiropractic, or osteopathy are manipulation, as also physical therapy is too. note: anything that is not the standard western medical doctor treating you IS alternative medicine. exercise therapy: going for a walk/jog , is alternative medicine. getting sunlight to increase vitamin d, is alternative medicine. eating right (and advice about it), is alternative medicine, whether a dietitian, nutritionist, Traditional Chinese Medicine practitioner, or others who have studied vitamins or minerals giving you advice about what is better in general. hippocrates said, "let your food be medicine, and your medicine be food". every field of medicine has advantages, and disadvantages. most alternative medicine is thousands of years older than the new western style medicine. and western medicine does not cure all disease states or conditions. the problem is that western medicine tries to pretend it does cure everything. if western medicine would learn that traditional alternative medicine care still can teach it much about lowering cost, and treating the person as a whole. a person is not just a physical object, like a car to repair. there are other issues in medicine. doctor is suppose to mean teacher, and guiding the patient so that they know more about when to seek medical treatment, compared to home care, and prevention of disease, instead of treatment afterward. the goal in alternative medicine is to educate the patient, and eliminate the need for medical care later, as well as cure what conditions currently cause problems. in alternative medicine you do not want the patient to ever return (sick) for more treatment, or at least try to eliminate that sickness that currently bothers them, as soon as possible.sometimes the body can heal itself, given the right circumstances. whole food vitamins/minerals or herbs (which contain those same things) are easier for the body to absorb. indeed whole food vitamins/minerals are best absorbed. your body knows what to do with food. a western doctor who won the nobel prize in medicine twice, basically said, "all disease is caused by a lack of vitamins and minerals". as most people would understand it, that sums it up. the united nations wants all to have opportunity for health care. many places in the world people are not as trusting of the pills and potions (hard drugs) approach of western medicine. they want cheaper, less invasive medicine. so they continue to use traditional alternative medicine. because they choose it, the only way those people get any health care is alternative medicine. like any medicine the risks are that there exist some who claim they know what they are doing, but they do not. con artists. certainly a beginner at a type of medical treatment is not usually as good as an experienced practitioner. the latest news I saw was that the United Nations wants all medical training to be the same standard by 2023 throughout the world. it would be nice, if western medicine would wake up to the fact that alternative medicine does treat conditions they have given up on curing. for example: insulin does not cure diabetes. but if you use alternative medicine, there have been some anecdotal evidence of increase in health. so much of my study of alternative medicine is about, teaching people what western medical studies have learned, that western doctors cannot prescribe by law, because they are whole food vitamins/minerals, but alternative medicine practitioners can teach you, and discuss your options that you yourself choose, and implement, becoming your own doctor. if you know what is best for you, then you having learned it, take what you want, and no longer need advice, because of what is shown in studies to increase life, and decrease disease. if/when I finish this degree, and get my doctorate in alternative medicine, there is only one state in the United States in which I may practice alternative medicine, or one foreign country. lack of knowledge is often the problem. if a management from western style medicine does not appear to ever have a hope of curing the disease, then you must consider if you should look to alternative medicine to add to the management of the disease. see anything in alternative medicine that can help? sure! makes sure the body has enough vitamins and minerals, and eat herbs that contain antivirals. they do exist.