Some travellers might get an upset stomach because of changes in food and water. Heat stroke can be a concern throughout the country in the summer and visits to the searing hot deep south between May and September can be very hard on your body. Otherwise, there are no major health concerns associated with visiting Algeria.
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Before You Go
There are no obligatory vaccinations but if you've arrived from sub-Saharan Africa then you will need a yellow fever certificate.
WHO (the World Health Organization) recommends that all travellers be covered for diphtheria, tetanus, measles, mumps, rubella, polio and hepatitis B regardless of their destination.
A comprehensive health insurance policy is not just a very sensible idea but will most likely be one of the requirements that you must show when applying for a visa. Make sure that whatever policy you take includes emergency repatriation to your home country.
Availability & Cost of Health Care
There are plenty of well-stocked pharmacies in all towns and reasonably good hospitals and clinics in cities. Facilities at private clinics are usually better than at government hospitals. In rural and southern areas medical facilities are far more rudimentary. If you're hospitalised you will be expected to pay upfront or arrange for your insurance company to cover your medical treatment costs.
It's best to avoid drinking tap water unless you treat it first with water purifying pills. Bottled water is widely available.
Algeria gets very hot between about May and October, southern desert regions dangerously so. Heat exhaustion and heat stroke are both very real risks. Make sure you keep yourself hydrated by drinking plenty of water, wear a wide-brimmed hat at all times and try not to expose too much skin to the sun. In the Sahara stay indoors between about noon and 4pm in the summer.
The Saharan regions have plenty of scorpions and snakes. Most are not as deadly as Hollywood likes to make out but some are, so the best advice is to keep your distance, check shoes and sleeping bags for unwanted guests and avoid turning over and picking up rocks (under which scorpions frequently hide).