I have a superstition about calling in sick when not exactly the case... When I worked for a company before I was self-employed, if I used sick as the reason to stay out for the day, I'd GET SICK for real, in a few days. I'd go for "personal reasons", which is legally a reason to take off in most states, and certainly is OK with most bosses if you have a good reputation for attendance.
And I need to also say, that before anyone calls me a lucky SOB for being self-employed, and thinks I can take off whenever I please, that's NOT how it is. I've had to do all kinds of hard work when REALLY sick, and nobody cares, and there's nobody to call in sick to. Case in point, I remember balancing on an icy ladder with a torch and roll of solder at 3:00 in the morning in a 75-mph wind, repairing burst pipes which were supplying heated water to the horse stalls in the horse hospital which used to lease part of our ranch in '07. And I did that with the flu, and while still feeling sick from New Years Eve two nights before.....
Charles