Being sick is not fun anytime. Although it might seem like a great idea to get your body aches massaged out because you're coughing and sneezing your innards out, it could cause more harm than good.
First, your body is trying to get rid of something that is making it ill. While you present symptoms, and even after you start feeling better you still may be contagious. It is so important to stay home during this time so that you do not get others (including your massage therapist and front desk staff) sick. Sharing is not caring in this instance! The CDC states that someone infected with the flu can spread to others up to 6 feet away. The flu virus is also able to stay on some surfaces up to 48 hours, so be sure to disinfect hard surfaces often, and wash your hands before eating or touching your face.
Secondly your body is working double time to fight off the contagion. Regardless if you're sick due to the flu, a cold, or sinus infection, your body needs rest and hydration. Please seek medical care to get necessary and proper medicines. Flu season this year is no joke. Untreated illnesses can lead to bigger and worse problems leading to a need for serious medical attention.
In addition, massage therapy generally increases circulation which may actually make you feel worse. Kinda like when you exercise while sick. While there is very little scientific research on the effects of massage during illness, the consensus is that it may actually increase symptoms instead of helping get rid of them. With the increase of blood circulation, there is also an increase in lymph movement. the lymphatic system plays an important part in the immune system. the lymphatic system is responsible for making and carrying white blood cells which help fight off illness and infections. This is how it is to believed that massage can boost the immune system. However, if you're sick in the first place, rest is best.
Besides, lying face down in a face cradle while you're already congested is torture. Get better soon, and then schedule your appointment.