Nobody invented these rules to make your life difficult. The long list you were handed after treatment — no blood pressure cuffs on that arm, no needle sticks, a sleeve for every flight, avoid saunas, don’t lift more than fifteen pounds — was assembled by clinicians genuinely trying to protect you, using the best reasoning available at the time. So this article traces where each rule came from, what happened when it was tested, and where things stand now. Understanding the origin makes the current guidance far easier to act on than simply being told the rules changed.

Not all bad information is equally bad. Some myths about lymphatic health are simply wrong, and believing them costs you nothing. Some cost you money, or time, or freedom you didn’t need to give up. And a small number can genuinely hurt you. Most articles treat all misconceptions as equally urgent, which makes it hard to know what to actually worry about. So this one sorts them into three tiers, from harmless to dangerous.