Why am i so hungry today??

Some days we have hungry days, and thats more so when we've been eating at calorie deficit for a while or if we're new to being in deficit.
Could be hormonal.
You could find that this is an isolated hungry day.
Could be because you did more exercise yesterday or earlier..theres a host of reasons why we have hungry days.
Sometimes its a matter of looking at macros, e.g hows your protein or fat intake?
If you track your calories and are consistently within your calorie budget you wont gain.
You'll probably find once you have dinner today your hunger will subside.

Have you been thinking or worried about something more than usual or not sleeping well? Seriously our brains burn so much energy even while asleep stress can quickly make you hungry.

Are you female? Where are you in your cycle? I get ravenous about 3 days before my period.

I allow myself to eat at maintenance on those days.

For me a ravenous day is usually one of 3 main reasons:

1) I have not eaten in a way that normally takes care of my hunger. Life is messy and demanding so sometimes I cannot eat in a way that is ideal.

2) I have not eaten enough. I have a pretty good handle on how fast I should try to lose so my base calories and selected rate of loss are all fine. However, refueling activity is something I have struggled with. I am much better at it now but it has taken some time to figure it out.

3) Response to deficit - This is my best guess for an explanation for why it comes around with no other obvious explanation. My theory is that because I am creating a famine state and forcing my body to use reserves to keep me alive every once in awhile it kicks up the hunger to see if I can get more food. My body doesn't know it is a controlled deficit and that I will not eventually die from it so it is a self defense mechanism. This is a theory. It is probably way off base. I will say that when I was super heavy I seldom had hunger days. I had them, just not often. It has been in my final approach to a healthy weight that I have experienced them more frequently.

I am male so I can't help if it is a TOM situation.

I eat three meals a day and a snack at mid-morning. There are a couple of days a month I wake up starving, too. I eat breakfast and I'm not satisfied, so I keep eating trying to fill the hunger void. I don't know if hormones are pushing this, it would be something to check into. So many things drive the hunger mechanism. NovusDies had some interesting insights into the problem, I'm going to do some research.

Pay attention to what you eat on the days you are hungry. It is so important to be mindful of what you ate when you feel hungry and when you felt full. For example; once I had some canned chicken noodle soup for a lunch. It triggered my appetite like never before. I figured it was the sugars as it was a processed food. Then, the other night I had chicken and broccoli for a quick dinner. I noticed how I felt full and content all evening and night long. I know to eat that more often now.