Is it ok to ignore a thick discolored big toe nail if it is not sore ?

While it isn't dangerous, it is unsitely. It is most likely a fungus living in/under the toe nail. It can usually be easily brought back to it's normal condition by applying Tea Tree Oil a couple times a day. You can find Tea Tree Oil at any pharmacy.Is it ok to ignore a thick discolored big toe nail if it is not sore ?
Yes. you have a fungal infection under the nail. There are drugs you can take but it is really only a cosmetic issue. Be careful when you trim or clean the nail so you don't spread the infection from one nail to another.Is it ok to ignore a thick discolored big toe nail if it is not sore ?
Whereas the most likely etiology for a thick discolored big toe nail is a fungal infection, which can be ignored (unless you have an underlying disorder such as diabetes or cancer or immunodeficiency state), there are other reasons for a nail such as that, such as a melanoma. In addition, thyroid disorders, trauma, inflammatory conditions such as psoriasis, and other rarer entities can make your nail look that way. You might want to get it looked at, including a culture for fungi. If that is negative, then you might even need a biopsy of it.