There are no health risks attached to travel to Portugal. There are no specific inoculations required to enter Portugal mainland. You should consult with the closest Portuguese consulate or the proper health services department about the most updated information. Health facilities are good and reciprocal health agreements exist with most European countries.
Good health care is readily available and for minor illnesses pharmacists can give valuable advice and sell over-the-counter medication. Most pharmacists speak some English. They can also advise when more specialized Medical help is required and point you in the right direction.