A burden is unwanted. Yes, the word has negative connotations.

An adverse reaction would be an unwanted, negative or unfavorable result of an action. Most often used to describe unwanted or negative side-effects of or allergies to medications.

they way tourists are wearing can attracts locals

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Positive effects of family planning are preventing unwanted pregnancy. Negative effects of family planning are contraceptives can interfere with womenÃ?s cycles and can have an effect on future fertility.