BG Health System

Your sim has a chance to develop an allergy symptom under the following situations: Spring/Summer, being outdoors, being in a dirty environment, or being in an industrial environment.

Your sim may get an Allergy shot to temporarily prevent these circumstantial allergies.

Getting Sick

Your sims will still contract illnesses either through daily routine activities or from someone else who is sick.

To prevent getting sick, you can purchase the Strong Immune System reward trait. To lessen the chance of your sim getting sick, you can  get vaccinated against the deadly diseases. Vaccinations are not permanent, however. After getting sick, your sim will have a temporary immunity from all illnesses in the mod.

What Happens When Sick

Your Sim's illness now progresses in three stages over the course of the illness. Over the course of each stage, your Sim will receive a buff that tells you what your sims have (i.e this buff is from Llama Flu).

If your sim has a non-deadly illness, they will start out in the most severe stage of the illness and will progressively get better. If your sim has a deadly illness, they will start out in the mildest stage of their illness and progressively get worse.

As you get better, your sim will be notified as to the progress of their recovery. As they get worse, the buffs will get stronger and your sim will be urged to attend to their illness.

Deadly illnesses last 3 days. Non-deadly illnesses last 1.5 days. You will also receive symptom buffs that will occur on occasion throughout your sim's illness.

There is a chance your deadly illness could improve on its own, but that's rare. Note that for NPCs they won't die of this illness on their own. Deadly illnesses will result in your sim dying of their disease if you do not take your Sim to visit the doctor.

Treating Illness

Home Remedies

For most non-deadly illnesses, they must simply run their course. You can treat these symptoms with rest (naps and sleep) as well as home remedies like orange juice and lemon-ginger tea.

Medication

You can treat these symptoms with medication.  Medication is only available if you have a symptom that medicine treats.

Medication will not only decrease the length of symptoms (by about 50%) but will also block that specific symptom from repeating during the medicine's effective time period.  Medication also has a chance to marginally decrease the length of your sim's illness.

Doctor Visit

In addition to medication, rest, and home remedies, your sim may go visit the doctor. Deadly illness require your sim to visit the doctor, but for non-deadly illnesses (with the exception of Itchy Plumbob) a visit to the doctor is optional. Your will not get better on their own and will only get progressively worse until they die.

A new menu called "SimHealth" will appear on the phone under the Household menu. The doctor will give advice on proper treatment for your illness whether that means rest and home remedies, medication, a shot while at the office, or surgery.

Your sim, if you choose, can injure themselves while exercising/fitness activities. This applies to children-elders. There's a small chance that while engaging in such activities, an injury is incurred. This happens more to sims with low fitness, clumsy sims, elders, etc. and less to sims who are more fit and healthier.

There's a chance that your sim can seriously injure themselves and thus require a trip to the Sports Injury Center. There doctors can determine if your sim needs further treatment such as a cast or surgery.

If your Sim gets pregnant, you may choose to have your sim attend prenatal appointments. They can get valuable advice about their pregnancy and can have the gender revealed, if desired. They can only go one time per trimester.

Additionally, your Sim can attend a postpartum checkup after birth. The Sim can also experience postpartum pain. Finally, new Sim parents can experience baby blues following the birth of a new baby.