3. Conjunctivitis. Conjunctivitis is more commonly known as pinkeye. It's a bacterial infection that causes eye redness and itching, burning, and swelling of the eyelids. This is usually accompanied by a discharge of the eye that may be yellow or green. Pinkeye is highly contagious and is passed along through the discharge from the eye when an infected person rubs their eyes and then touches something. Though it is a bacterial infection, conjunctivitis can be treated with anti-bacterial eye drops and most are able to return to work within 24 to 48 hours of treatment.

4. Stomach ailments. A mild case of indigestion or sour stomach usually isn't cause for alarm. However, vomiting and diarrhea, especially when accompanied by a fever, could be a contagious stomach virus. If you choose to go into work, you could be putting your co-workers at risk.

5. Other considerations. Even if you aren't suffering from any of the maladies on this list you may still have reason to take a sick day. Use good judgment. If you are feeling so bad that your work productivity may suffer, causing you to make costly mistakes, it may be a good decision to take a day off and rest. You should also consider calling in if you are taking any medication that may impair your ability to operate a vehicle, or other strenuous activity. In some cases like these, coming into work may end up costing your company more in losses than if you would have just stayed home.

WHEN IT'S SAFE TO GO

If you're dealing with some minor sinus issues -- nasal congestion, facial pressure or headaches -- then chances are you can go to work without any concern as long as you feel like it won't interfere and don't have a fever. An over-the-counter decongestant may provide some relief and help you get through your day. The same goes for mild stomach irritations such as acid reflux, indigestion, or sour stomach. However if you are experiencing severe diarrhea or vomiting, accompanied by a fever, skip the milk of magnesia and go see a doctor.