Ways to help lessen chance of getting AMS:
When planning your itinerary NEAT takes into consideration the altitude and other factors to lessen the chance of getting AMS.
Altitude gains-your trek is designed to gain around 600 meters (vertical) altitude daily.
Acclimatization - rest days are included in itinerary to help body adjust to new altitude.
Each trekker must accept responsibility too and trek slowly - observe the pace at which the porters walk. There are no worthwhile prizes for getting to destination in record time - generally AMS.

Treatment: Mild symptoms - staying at same altitude may resolve symptoms. If little or no improvement, descend to lower level.
Severe (HAPE + HACE) - descend immediately, as failure to do so could result in death. If symptoms persist you may need to be portered to nearest medical facility or evacuated by helicopter.